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environ['werkzeug.server.shutdown'] function is deprecated #1780

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@anders-kiaer

Description

This line

stopper = flask.request.environ.get("werkzeug.server.shutdown")
gives

[...]/python3.7/site-packages/dash/testing/application_runners.py:122: UserWarning:
  The 'environ['werkzeug.server.shutdown']' function is deprecated and will be removed in Werkzeug 2.1.

See pallets/werkzeug#1873 and https://werkzeug.palletsprojects.com/en/2.0.x/serving/#shutting-down-the-server.

The function is said to be removed in Werkzeug 2.1 (Werkzeug is currently at 2.0.1).

Related issue over at plotly/jupyter-dash#63.

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